Manhunt for Boston Bombing Suspect

WATERTOWN, MA - APRIL 19: Residents of an apartment building watch as members of the FBI, State Police, Boston Police, Cambridge Police, and other law enforcement agencies, survey the perimeter on April 19, 2013 near the home of suspect #2 on Norfolk Street in Cambridge, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Jared Wickerham/Getty Images)

Shootings In Cambridge, Watertown Draw Massive Police Response

WATERTOWN, MA - APRIL 19: A woman reacts while being questioned by the Cambridge Police and other law enforcement agencies on April 19, 2013 near the home of suspect #2 on Norfolk Street in Cambridge, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Jared Wickerham/Getty Images)

Shootings In Cambridge, Watertown Draw Massive Police Response

File photo of members of the FBI investigating a crime scene. ( Photo by Jared Wickerham/Getty) Images

WATERTOWN, MA - APRIL 19: Members of the FBI, State Police, Boston Police, Cambridge Police, and other law enforcement agencies, survey the perimeter on April 19, 2013 near the home of suspect #2 on Norfolk Street in Cambridge, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Jared Wickerham/Getty Images)

Shootings In Cambridge, Watertown Draw Massive Police Response

WATERTOWN, MA - APRIL 19: Members of the FBI, State Police, Boston Police, Cambridge Police, and other law enforcement agencies, survey the perimeter on April 19, 2013 near the home of suspect #2 on Norfolk Street in Cambridge, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs (Photo by Jared Wickerham/Getty Images)

Shootings In Cambridge, Watertown Draw Massive Police Response

WATERTOWN, MA - APRIL 19: A woman reacts while being questioned by the FBI and other law enforcement agencies while residents look out of their windows on April 19, 2013 near the home of suspect #2 on Norfolk Street in Cambridge, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Jared Wickerham/Getty Images)

US-ATTACKS-BOSTON

A dog sniffs equipment before Massachusetts Governor Deval Patrick spoke to the media at a shopping mall on the perimeter of a locked down area as a search for the second of two suspects wanted in the Boston Marathon bombings takes place on April 19, 2013 in Watertown, Massachusetts. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

Shootings In Cambridge, Watertown Draw Massive Police Response

WATERTOWN, MA - APRIL 19: Onlookers take pictures as they watch from windows while SWAT team members search for one remaining suspect at a neighboring apartment building on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Mario Tama/Getty Images)

Shootings In Cambridge, Watertown Draw Massive Police Response

WATERTOWN, MA - APRIL 19: SWAT team members search for one remaining suspect at a residential building on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Mario Tama/Getty Images)

Shootings In Cambridge, Watertown Draw Massive Police Response

WATERTOWN, MA - APRIL 19: SWAT team members prepare to search for one remaining suspect at an apartment building on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Mario Tama/Getty Images)

Shootings In Cambridge, Watertown Draw Massive Police Response

WATERTOWN, MA - APRIL 19: SWAT team members aim their guns as they search for one remaining suspect at an apartment building on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Mario Tama/Getty Images)

Shootings In Cambridge, Watertown Draw Massive Police Response

WATERTOWN, MA - APRIL 19: Metro SWAT members hang off the back of a truck as they prepare to search the School and Walnut Street neighborhood for one remaining suspect on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Darren McCollester/Getty Images)

Shootings In Cambridge, Watertown Draw Massive Police Response

WATERTOWN, MA - APRIL 19: Police convene on School and Walnut Street on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Darren McCollester/Getty Images)

Shootings In Cambridge, Watertown Draw Massive Police Response

WATERTOWN, MA - APRIL 19: An elderly woman is evacuated from the School and Walnut streets area as police prepare to conduct a massive search for the one remaining suspect on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Darren McCollester/Getty Images)

Shootings In Cambridge, Watertown Draw Massive Police Response

WATERTOWN, MA - APRIL 19: Metro SWAT members hang off the back of a truck as they prepare to search the School and Walnut Street neighborhood for one remaining suspect on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Darren McCollester/Getty Images)

Shootings In Cambridge, Watertown Draw Massive Police Response

WATERTOWN, MA - APRIL 19: Military Police arrive in armoured vehicles at the parking lot of the Arsenal Mall on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Jared Wickerham/Getty Images)

Shootings In Cambridge, Watertown Draw Massive Police Response

WATERTOWN, MA - APRIL 19: Boston Police mobilize in the parking lot of the Watertown Mall on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Jared Wickerham/Getty Images)

Shootings In Cambridge, Watertown Draw Massive Police Response

WATERTOWN, MA - APRIL 19: Boston Police Commissioner Edward Davis (L) and a Watertown Police official speak during a media briefing in the parking lot of the Watertown Mall on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Jared Wickerham/Getty Images)

Shootings In Cambridge, Watertown Draw Massive Police Response

WATERTOWN, MA - APRIL 19: Police walk down School and Walnut Street on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Darren McCollester/Getty Images)

Shootings In Cambridge, Watertown Draw Massive Police Response

WATERTOWN, MA - APRIL 19: Police on School and Walnut Street as the search continues for a suspect on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Darren McCollester/Getty Images)

Shootings In Cambridge, Watertown Draw Massive Police Response

WATERTOWN, MA - APRIL 19: Police convene on School and Walnut Street on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Darren McCollester/Getty Images)

Shootings In Cambridge, Watertown Draw Massive Police Response

WATERTOWN, MA - APRIL 19: Police on School and Walnut Street on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Darren McCollester/Getty Images)

Shootings In Cambridge, Watertown Draw Massive Police Response

WATERTOWN, MA - APRIL 19: Boston Police mobilize in the parking lot of the Watertown Mall on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Jared Wickerham/Getty Images)

Shootings In Cambridge, Watertown Draw Massive Police Response

Photo: Mario Tama/Getty Images

WATERTOWN, MA - APRIL 19: A police officer runs with his gun drawn while searching for a suspect on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person wanted in connection with the deadly bombing at the Boston Marathon earlier this week. (Photo by Mario Tama/Getty Images)

Shootings In Cambridge, Watertown Draw Massive Police Response

WATERTOWN, MA - APRIL 19: Police investigate along Dexter Avenue in the early morning hours on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person wanted in connection with the deadly bombing at the Boston Marathon earlier this week. (Photo by Mario Tama/Getty Images)

Shootings In Cambridge, Watertown Draw Massive Police Response

WATERTOWN, MA - APRIL 19: Police with guns drawn search for a suspect on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. It's not clear whether the shootings are related or whether either are related to the Boston Marathon bombing. (Photo by Mario Tama/Getty Images)

Shootings In Cambridge, Watertown Draw Massive Police Response

WATERTOWN, MA - APRIL 19: Boston Police gather in the parking lot in front of a Best Buy store on April 19, 2013 near the Watertown Mall in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. It's not clear whether the shootings are related or whether either are related to the Boston Marathon bombing. (Photo by Jared Wickerham/Getty Images)

Shootings In Cambridge, Watertown Draw Massive Police Response

WATERTOWN - APRIL 19: Police descend on School and Walnut streets in search of suspects April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. It's not clear whether the shootings are related or whether either are related to the Boston Marathon bombing. (Photo by Darren McCollester/Getty Images)

MIT Police Officer Shot On College Campus

Photo by Mario Tama/Getty Images

WATERTOWN, MA - APRIL 19: (ALTERNATE CROP) Police with guns drawn search for a suspect on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. It's not clear whether the shootings are related or whether either are related to the Boston Marathon bombing. (Photo by Mario Tama/Getty Images)

MIT Police Officer Shot On College Campus

CAMBRIDGE, MA - APRIL 18: Police investigate the scene where a Massachusetts Institute of Technology campus police officer was shot and killed at the camous on April 18, 2013 in Cambridge, Massachusetts. Police are conducting a manhunt around campus for the shooter. (Photo by Mario Tama/Getty Images)

MIT Police Officer Shot On College Campus

CAMBRIDGE, MA - APRIL 19: Police investigate the scene where a Massachusetts Institute of Technology campus police officer was shot and killed at the camous on April 19, 2013 in Cambridge, Massachusetts. Police are conducting a manhunt around campus for the shooter. (Photo by Mario Tama/Getty Images)